Question # 1

Which of the following has no hydrogen-bonding

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Diethyl ether

Water

Ethyl alcohol

Phenol

Ratio of hydrogen (H) and oxygen (O) in water molecule by volume is

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2: 1

1: 2

3: 1

4: 1

A solid nitrate fertilizer reacts with an alkali to produce a gas which turns damp pH paper blue:

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NO₃

NHO₃

NH₂O

N₂H₄O₃

Which of the followings has electronic configuration of Ar in +3 oxidation state

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Sc

Mn

Ti

Zn

Which one of the following is an organic compound?

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Calcium carbide

Calcium cyanide

Carbon disulphide

None of these

The molecule of CO₂ in dry ice form are the:

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ionic crystals

covalent crystals

molecular crystals

any type of crystals

Which is the following would have most like an ideal gas at room temperature?

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carbon dioxide

helium

hydrogen

nitrogen

Molar mass of repeating unit of PVC monomer is:

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43

53

63

73

The temperature in the incineration of industrial and hazardons waster process had a range:

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950 to 1300°C

500 to 900°C

250 to 500°C

900 to 1000°C

How much heat is absorbed by 100 g of water when its temperature decreases from 25°C to 5°C? (heat capacity is 4.2 J/gK)

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84,000J

2000/4.2J

-2000/4.2j

-8400J

Chemicals used to kill pests are:

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Herbicides

Insecticides

Pesticides

fungicides

Which statement is incorrect for and ideal solution

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The forces of attractions between solute and solvent molecules are same

There is no evolution or absorption of heat

Volume of the solution is less than sum of volumes of individual components

Vapour pressure of solution is directly proportional to the mole fraction of solvent

When electrons revolve in stationary orbits

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There is no change in energy level

They vecome stationary

They are gaining kinetic energy

There is increase in energy

Li has the lowest reduction potential while the element with highest reduction potential is

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H

F

O

N

The factor which effect the rate of reaction

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Nature of reactants

Surface area

Light

All of the above

Benzene hexachloride is used as

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Dye

Antimaterial drug

Antibiotic

Insecticide

Which is not property in ether:

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Very weak hydogen bonding

High b.p

Slightly soluble

Inflammable

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+712 KJ mol^-1

+492 KJ mol^-1

-932 KJ mol^-1

-960 KJ mol^-1

The bibre which is composed of at least 85% by weight of acrylonitrile is known as

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Royan fibre

Azlon fibre

Saran binre

Acrylic fibre

Which of the following oxides is peroxide?

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Na₂O₂

MnO₂

BaO

SO₂

The radius of first orbit of H-atom is

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4.75 A°

3.84 A°

8.4 A°

0.529 A°

Which are used as essences (flowers)?

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Aldehydes

Ketones

Alcohols

Esters

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